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;;; hmac-md5.el --- Compute HMAC-MD5.
;; Copyright (C) 1999, 2001, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
;; Author: Shuhei KOBAYASHI <shuhei@aqua.ocn.ne.jp>
;; Keywords: HMAC, RFC2104, HMAC-MD5, MD5, KEYED-MD5, CRAM-MD5
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Test cases from RFC 2202, "Test Cases for HMAC-MD5 and HMAC-SHA-1".
;;
;; (encode-hex-string (hmac-md5 "Hi There" (make-string 16 ?\x0b)))
;; => "9294727a3638bb1c13f48ef8158bfc9d"
;;
;; (encode-hex-string (hmac-md5 "what do ya want for nothing?" "Jefe"))
;; => "750c783e6ab0b503eaa86e310a5db738"
;;
;; (encode-hex-string (hmac-md5 (make-string 50 ?\xdd) (make-string 16 ?\xaa)))
;; => "56be34521d144c88dbb8c733f0e8b3f6"
;;
;; (encode-hex-string
;; (hmac-md5
;; (make-string 50 ?\xcd)
;; (decode-hex-string "0102030405060708090a0b0c0d0e0f10111213141516171819")))
;; => "697eaf0aca3a3aea3a75164746ffaa79"
;;
;; (encode-hex-string
;; (hmac-md5 "Test With Truncation" (make-string 16 ?\x0c)))
;; => "56461ef2342edc00f9bab995690efd4c"
;;
;; (encode-hex-string
;; (hmac-md5-96 "Test With Truncation" (make-string 16 ?\x0c)))
;; => "56461ef2342edc00f9bab995"
;;
;; (encode-hex-string
;; (hmac-md5
;; "Test Using Larger Than Block-Size Key - Hash Key First"
;; (make-string 80 ?\xaa)))
;; => "6b1ab7fe4bd7bf8f0b62e6ce61b9d0cd"
;;
;; (encode-hex-string
;; (hmac-md5
;; "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data"
;; (make-string 80 ?\xaa)))
;; => "6f630fad67cda0ee1fb1f562db3aa53e"
;;; Code:
(eval-when-compile (require 'hmac-def))
(require 'hex-util) ; (decode-hex-string STRING)
(require 'md5) ; expects (md5 STRING)
(defun md5-binary (string)
"Return the MD5 of STRING in binary form."
(if (condition-case nil
;; `md5' of v21 takes 4th arg CODING (and 5th arg NOERROR).
(md5 "" nil nil 'binary) ; => "d41d8cd98f00b204e9800998ecf8427e"
(wrong-number-of-arguments nil))
(decode-hex-string (md5 string nil nil 'binary))
(decode-hex-string (md5 string))))
(define-hmac-function hmac-md5 md5-binary 64 16) ; => (hmac-md5 TEXT KEY)
(define-hmac-function hmac-md5-96 md5-binary 64 16 96)
(provide 'hmac-md5)
;;; hmac-md5.el ends here
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